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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee223f6e9b1c2b18b2124d17143105b551a791cea07b402b5223402f2ee5505f' 
  AND token = 'upVBfzkl63ge62jnfOAm0tqPVffZjTUgmR3fWCKvKMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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