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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b69e51af6a2c9b66e587706c7e68f90d5ba360a79177aeb4cdba4cbb37535a68' 
  AND token = '4ozsh/ShocMNnG1fnI/PMY/5hkEF8AEU2Y2D27zJW0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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