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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95e20b47f97ffb14fc05ce8903b796c79cc04b26b85fc9ba6f243349118371db' 
  AND token = '1aQzfoel3Ujy9Fv6yeUUzVbXufPTX9N0Z+O12DU75Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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