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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '796fa8b2f22e477edee5665dbce722fa7c36c9b5f81b53ef1a4f5c7ae0d3a6b5' 
  AND token = 'TdiEMyK3mCreFHwKEqT6htPGesZ7k8drXo7yOjOLYGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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