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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf420cc80776a11016a2b69f5e8b186cd38db6fe15cfa8e60ffd379126a196cd' 
  AND token = 'W6E3+JiAN0Lln2BiirB7u2THOB7sEYyKWWUrt8rz9YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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