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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf3f23abced87e38dd687a22c8ab7adbec6712b57b0225ecd2e496daebec9266' 
  AND token = 'QfB+pbehMj4v0xf1SuCnOSRjZ6PL1MbvR1xXbREhqlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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