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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '828430ef09520e6137b6d3db0a9c889812e5f52d75ed943cbdcd1cd87cb5f94c' 
  AND token = 'c6Nq3JEXQqHb0LVQDsVyo57R0/KTyL3xR7lj6FEBmM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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