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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74e6fd9cd2ee52b6fff0e610a6dee4396153f2a220ecdcb6226a039369f90968' 
  AND token = 'xZh5q3YRmWt1nkW19z5qVEMSg1I0vuRn9/biTPP6yAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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