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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea9de5f7eb3a5b7635c15b21b7e128849c07cbb6c43b5d9fd631c6c771a21810' 
  AND token = 'erou9GwVlPg4H7jdh4DSS3IczTlQNLPG4mu1FjGLhbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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