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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b0d9c89fa987e3228e5a8005eb87290915e1d037c8062a1b0665ca93512fc3e' 
  AND token = 'UdOFN00PXLhigVfvEZ1XcQ8YKtECksX8pSUOcVe4uv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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