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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07b2a46ce814daa74c05b15331c200e9ef44325d2edb59846022fe60a671e4d9' 
  AND token = 'CQQ0qI3WcLo2LaaveS7a80RJF66L3LHwUk7jt5Gxx1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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