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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c205fad5782d8064ae922adffd6e02c99ccd40be768b20210ec22d85890f9ed6' 
  AND token = '1V2q57zRMGC4Y8wSMZvT5S0zAOrduIzRKb7pOwX9j9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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