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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4f1880458a3ffd376bbf8062eb86827348ce01cd40cefb5e7fcddd1d41befa4' 
  AND token = 'vgKcwMG7QBpBogzcNzMpcwVcm7JWfJ35kW5X0ZKW5S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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