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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1337f3c6c8d75401c3859d185475e1b584a7bb4ec0f78706a8ae6c2dfe44b7fb' 
  AND token = 'f/dgW9RS4EmWmYB4tkTpWkGP884Qa7SmhhSxwLNb44Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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