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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ced7a8076e3c56526b740f4c7a47cbceffa2001d8bb5e8ac311385b206d71b9' 
  AND token = 'aH5t8hrzu0vzIU03D5XjxpMTWo5y16qN+YZ+SbXkp8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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