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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b10c69bbbca7d9be4f65427c56f479b795e80ac2259cc808cae2cb0a1edbecaa' 
  AND token = 'Ro7FdUwkAzwo6zjt517T6vJVBOtiU4b2GbU0UuE54uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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