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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55bb7dc79f00faab266f12ceaa068dc20da1ca049359884740e9f7ff8946d53b' 
  AND token = 'HmTXcWtHTuMoa45zpAg8k+NQSojeRaKDWU7xqbUQn94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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