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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69234c0e768cbef9b43d466c22c6f0999f719587a3b821b71d585535dc4cabad' 
  AND token = 'M/aD3ygEZo+ypQ9ffv66vJ3WIvxp076smkpLO4nsNEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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