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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5f388d0a6778071863b3c8e8993f5ee0d9fd99e766c7f8d602a15f52e87e93f' 
  AND token = 'pdwDeEwijv6z/PoOsOyI8mfocbrvoltY4SbACJMMnSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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