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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4b9449550256dc3347842585e39f6d300192440eb3ad9dfc0ac58107d60f4d7' 
  AND token = 'S4nb/oGXBpr5KISNwrWNL5sC1urY4Y5q5b31fRijlXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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