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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5b3ec799b81190ac824c6062a835ff472c367e2a77ef81d30b064ee56b2ce9e' 
  AND token = '3COr62PAsgBtziamIEM17YMFI5A8YdKyA4zaMA/niYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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