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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94599666a39ae23c70b221b837b7327239cff4147f1863856de867489becdb46' 
  AND token = 'vbUwXY8hEacpcMfN2tF1r4SrlVNKALvFzfspFN4Cp1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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