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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c2dfede0108e6e7f5dfad6669c295f9ac5e07fccd62da67bf46f7d9d5293fcf' 
  AND token = 'ChXdYcyF/5CbP4Y0XMFElLzwjZtoGF5f6dHaKIiHIQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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