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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7f223bd5986fbd378266da0ac857e3d51ccc5c2b3fe81357b6e27d2521c837d' 
  AND token = 'mVwkIjOZa88co180xqd2HHrq1Ee376wcVpzdJRMssrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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