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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea58ba7660efb9c38b43b4bc760b713e20f48ef9579e52a917a67e5b0683c5e4' 
  AND token = 'EK05q0a6NltTVr5lqaG7+CQ4FiE63I4i6CnaU4e+JNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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