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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5f4374783366f581f5474512ce347b98f41e12ca4e84d56465e7a445f5659e2' 
  AND token = 'PvJkLEyYtel3x+ib/c2+plAdg5peGa2jpl1jJZXaz24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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