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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9462cf6257f77e404f2c9f83f46844c03e7adf57c4bfc5503f7f35f0e7cf2036' 
  AND token = '17zrGzNugMKtcJwHuBKssE84/ccgXvYKH2a7YEfJY5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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