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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63c8c9753e1519bba931fd402aac55594c0262ac0011bce4733dbbe7df6a37b3' 
  AND token = 'yLKTnojJqhuMPtXDMgjMsl5LSAnm96dMp3yS+0y7FBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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