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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96faa6ba30c07fe6912870c4a52391bb53a312d8cc73616aa254a8ae3350048e' 
  AND token = 'XrHfhfM6PxUkXAgCp01igFMksOg3vtSnyejIkg/58k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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