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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dee674512653011ff3996d2840a4c1091ee2fe8a02253a7805f494ff54e9100' 
  AND token = '6fHI6LcJlrvS8/nh9Fx73pObPEhksVDipYamPGIkDOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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