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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc79ae2026531eab27d939f5c8a6b9bf2ecffee9ddfc8afc1520de74572cddd5' 
  AND token = 'Adh4FW2hxNvhGhCPi05AUrZ6n3lgIAudFShqCb7gpt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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