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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce27eea98cd9cfc7fca8ed77c7397ae8b10edab6674e1a1405c1934d4b3f973c' 
  AND token = 'L0/rX/T7sryJ+KnRJmFh3NzVLjvyaK/frMCYL9yOh04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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