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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f762b2b9bca250336b002cce79525f16647d65e109eb382bd12e62f908ad9f9' 
  AND token = '1h2cRxIRX+Em62wTyfseM7BT6qm7IJKq+fgJs+4me8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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