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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e1e63d6d05a707feb326403b8c43b1f1d7be20ec4037dd652858c5cebdcecca' 
  AND token = 'm+SxzR5m6w4SIoq1d+Mx73tlqOZYWqtotkjz8PajVZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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