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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '260b9c19881d4fb8b3b487d3dc999d71351667a3e2b18509a26cdcdea0633686' 
  AND token = 'gvOa35moYNGZ2zXhNcm2Rg4qlzipkeN2QhbW/mTm0P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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