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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a66530303b6df29b8e37f33d37157dcb7d1aca6e7d305100be0b0c17782db11' 
  AND token = '2udBBIFXqXX6Y9wTVuHWaNAMZTowKQFWJIOOjtuYOQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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