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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2632f19cedf49edb7cb8537ce04c805f8fc7b4beaaf71c885668e7d744555844' 
  AND token = '0G5jPeLbxAuANMMTg4p2g/7b58OzvtmTK6HGO9Qi85g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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