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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fec0db9d183124e4ccdea571fe195b35bbfb9a6741d3dffb45f24f2634a4f23b' 
  AND token = 'ShZ2d2OXO+Yugwz005djymfobEFk/IrNjU82GsdX7Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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