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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fa5c83b9d03c2d7b72878d48da69a03c988301b80a7843935a08857c8e8a1a2' 
  AND token = 'G7t34SYQaocp3ja999jT8W1hdKwwNSi6CaeyYbUOLZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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