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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81cba30a4bbcf53b73167ac29f9837ff86e38ed0ac48bf54304b6fd28db67b36' 
  AND token = 'pC0STULWXVeKzKEE1cAVmbEARXAc9eLYYdk5pzp/0tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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