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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edc7d64e7db7b9d5149872b4cf368b6fad3db6d80a2c4746b0db91b18cda5f13' 
  AND token = 'QZwdiMZwHLt+IsfnZlqZwJRDD+VAe+RPE0/AcWTqqt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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