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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83a3666ac03ab6091ca2fd6ddf7311b3bb8293b715ce21f06c689711bfb1db84' 
  AND token = 'c+DPfDtUfm0uwVTX7IKcsA1mIX4NvuHomyh+IMEBPIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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