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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdf7228453c719340fa19a2d4bf26d295711c74afa8bcc63af0b3935fc1bfae7' 
  AND token = 'lW68mn0fV7u3fCLXBOqRoNdMHAZKK5WpXk4Q9sXfcqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}