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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c318dfa8a4ff1fb6b9380a3a9fedc2f42903344558f4f126134562c421c4767b' 
  AND token = 'eu7Hxf8n0cK0fXNcHAcncOptHH04yPDmu9uSh4zLisY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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