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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74000311c5ba5d4693ae3aae579ed3827af3a051c3cd43704ef5b8db700665d6' 
  AND token = 'qE9GzS5pUDpmj2rC+4+DUUZ7n64hLZAVQnIc8ttgG8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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