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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc3493425f7b1216f825704fba95cdf34cbb0b606a240d44f4c7e9b51592354c' 
  AND token = 'o+5Gwxo34r4ELXs85Y+ZRxfLWxCzjRFMQZZ3mLcK4zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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