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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41593353abb210be0b126499f44bb62c5c922c7d6a9ee855452b5979662e4856' 
  AND token = 'Fak0oLRONTUADv0DNJrvL+8wQve0+VkRhJT7+9+/J/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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