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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d9833489ece90c534964dbf735b4d5a7ae88a4f53cb56ce76a653c3dcde372b' 
  AND token = 'qgfhF/X+/V/RnBtbd8Gy/dSFCQv2CIbcHE4RMGVc+8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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